CAPAPROOF PU is a one component liquid applied roof waterproofing based on pure polyurethane, consists of a polyurethane resins, mono-component, elastomeric without reinforcing mesh (only in singular point: evacuations, upstands…) internal layer; which once polymerized conforms an elastic lining, in form of a layer completely bonded to the support (steel, concrete, mortar, ceramic, foam polyurethane (PU) and other waterproofing membranes like PVC, EPDM and bituminous). The minimum layer thickness of the assembled membrane has to be 1,2 mm.